Major Sarah Schwennesen, a spokeswoman for Davis-Monthan Air Force Base said, "Angel Thunder is the biggest rescue training exercise in the world. It grew from a local exercise at Davis-Monthan Air Force Base."

The two-week exercise brings together military from eight different nations, like France and Sweden. Major Schwennesen said Angel Thunder is designed to provide training under incredible circumstances: "They're practicing different ways of putting ranger and commandos and pararescuemen into any hostile situation."

Their training turned very real over the weekend. Training pararescuemen put their skills to the test on a five-day mission to rescue two injured Chinese sailors who were on a Venezuelan fishing boat off the Mexican coast.

"A lot of them have been just floored by these exercises: How realistic it is that, in fact, many of the scenarios they were trained for was something they got pulled off of on a real world situation."

Most rescuers are back and at it again, getting crucial training across the skies. Training will continue until May 17.